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I found that is crosses to a gates 33009 which fits Chevy among other things 33009 by GATES - Engine Coolant Thermostat - OE Type

From your first post, you state that you have both push and pull fans. Is this correct? I find that puller fans only work best.

Like John asked, what is hot? 210? 220? What are you using to check the temp? Aftermarket gauge or factory gauge?

Did you replace the water pump housing? I remember guy's talking about aftermarket water pump housings that had poorly drilled passages causing restrictions.

What size radiator? 22" or 26"? It's doing it's job removing heat from the coolant. What engine?

I agree with the quality A/C shop, if the system has a charge in it you will want that recovered. If it's empty I would go to R-134A

Great that you found the leaks, I wouldn't see any reason you couldn't use the smoke machine. Yes I use the one at the shop for EVAP systems, but it can be used for just about anything you can think of like the intake or exhaust

I like Dave's ideas to hold it from turning, but if you want a universal tool this one comes in most clutch remover kits...

I vote for the recore, but I have a radiator guy I trust and has done a lot of work for the shop for a lot of years. The modern cars just get replacements so we only use him for classics.

Same 2 row core or did you go to a 3 row? He didn't want to rod it out, you said the top didn't look that bad?

Off topic, but judging by your screen name your a Big Block Chevy fan.

So your just looking for a new hose?

When we first started doing retrofits we were told the 80% of charge rule, but as time went on they say you can use up to 100% charge level.

If you can get it charged with R-12, great. The method Dave outlined is the ultimate for long term R-134A usage. I have converted many systems by doing limited work to the system, evacuate the R-12 if system has any left in it, replace the receiver/drier, the h-block, add pag oil, pull a vacuum...

Dave beat me to it, leave it or plug it like commando said, wont make a difference in the operation because your system has other switchs

It's a high flow thermostat, I guess in this case it was the thermostat:D

To let some air bypass the fan at highway cruise speed

I remember reading a post a while ago about one of the water pump housings with too small passages and the poster opened them up to match the original iron housing.

This looks like a interesting fan swap.

If your only going to run the electric you need a good shroud so all the air goes through the core.